Handle for rock drills



4Jung 29, 192s.. 1,590,268

` G. G. TUTTLE HANDLE FOR BOOK DRILLS Original Filed March 5, 1923 @iINVENTOR.

Patented June 29, 1926.

UNITED STATES PATENT orties.-

GROVER G. TU'TTLE, OF PHILLIPSBURG, NEW JERSEY, ASSIGNOR TOINGERSGLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A. CORPORATION OFNEW JERSEY.

HANDLE FOR ROCK DRILLS.

originan application filed March 5, 1923, sei-iai No. 622,748. Dividedand this application inea oetober 1s, 1924. serial No. 744,462. 1

rlhis invention relates to fluid pressure operated rock drills of thehammer type, but more particularly to air feed control for the feedingelement of'a stope drill.

This application is a division of applicants copending application,Serial` No. 622,748, tiled March 5, 1923.

.Stops drills are usually provided with a laterally extending handlewhich the operator turns to provide rotation for the steel. In the caseof self rotating tools, this handle is used for the purpose of holdingthe drill from rotating'while the steel is turned in the rock. Formaintaining the steel vagainst the work, there is ordinarily provided anair feed supplied with' motive fluid from the main source for thethrottle or other controlling valve for the drill so 'that when thepiston of the drill is operating, air is simultaneously being fed to theair feed cylinder. It is a common occurrence for the drill steel tostiel; in the hole while drilling and the most t convenient way ofloosening the steel is to continue operation r of the hammer piston inthe drill cylinder,

and at the saine time to release the pressure in the air feed cylinderallowing the steel to be withdrawn somewhat. Almost unvoluntarily7 theoperator pulls down on the rotation handle when the drill sticks sensingthat the steel must be withdrawn from the hole in order to continuedrilling. Under these conditions, it is very inconvenient for theoperator to operate the throttle valve because it is the usual practiceto arrange the throttle valve so that the drill stops hammering beforethe air feed is relieved.

It is an object of this invention to provide an air feed release `whichis controlled by the unconscious action of the operator in pulling downon the rotation handle when the sticking occurs. V

Further objects of the invention will ap pear from the followingdescription taken in conjunction with the accompanying drawings, inwhich- Figure l is a side elevation partly in vertical section of astope drill embodying the invention7 Figure 2 is an enlarged detailedview in longitudinal section of a portion of the rotation handle shownin Figure l wherein the grip supported by the handle extends downwardly,and

Figure 3 is a detailed view in longitudinal section of a rotation handlereversed so that the grip extendsupwardly but still operates to releasethe air feed when the grip is pulled downwardly. Y Referring tofthedrawing, a stope drill is illustrated iny Figure l having the usualcylinder A and front head B carrying the drill steel C. The front head Bis attached to thecylinder A bythe usual side bolts D and the cushionsprings E. The cylinder A and its operative parts comprise thepercussive ele1nent`(not shown) of the tool for imparting the impactblows ofthe pistonto the drill Isteel C. The drill steel may be rotatedvin any suitable manner, but in this instance is adapted to be rotated bya gear niotor (not s own) enclosed by the gear cas-V ing F.

The feeding element comprises the usual feed cylinder Gin whichtheipiston His adapted to slide. The piston rod J, which carries therock engaging pointer K, is' secured to the piston `H. Between the gearcasing F and the feed cylinder G is located the head block L to which issecured a laterally extending rotation handle'O whereby the `operatormay hold the machine against vrotation with thel drill steel C. In thisinstance, the handle O is provided'with a portion'O extending at rightangles either up or down as vshownin Figure l. `Motive fluid foroperating the tool is 'supplied through the inlet L and simultaneousadmission of motive fluid to the cylinders Gr and A is controlled by asuitable throttle valve (not shown) having a valve handle P. The portionO of the rotation handle O is provided with a sleeve or grip Q, which isrotatable for the convenience of the operator and is adapted to slidevertically on the portion O being held against removal by the cap R. Thegrip Q. is preferably providv ed with end flanges Q to prevent slipping-of the operatorls hand from the grip. ln sliding up and down, the gripQ is adapted to open or close as the case may be, the valve Sreciprocable transversely through the portion O for controlling apassage way T leading from the air feed cylinder Gr to atmosphere,preferably through a bore in the cap R. To this end the portion O oftherotation handle is provided with a transverse bore V and a counter borelV. The valve S is adapted to seat at the junction of the bore V and thecounter bore W and is provided with a head X adapted toL oe pushedinwardly by the cani like action of a spherical groove Y on the insideoi' the grip,

Normally,'the valve S vis heldfclosed by means of a suitable spring Spressing hetween the body Z ot the valve S and a hollow screw ovthreaded in the counter hoi'e W.

The grip is; normally held'up hy a/ coil spring c. rihe coil spring oencirclesfthe'free end of the portion Q land in this instance hears withoneend-against the grip Q andl at itsother end isfseat'edf on the cap R,so that in order to open the 'valve S thel grip Q must he pulleddownwardly. Rotation of the grip' Q does not' aiieot the valve S sincethe groove Y is of an annular form. d

`Villen the grip `Q is ,pulled down, the

`groove Y pushing against the head X of the `Valve :Si 'the 'air `-tlohthe Cylinder G '1S than Permitted lk Oti'tthlghtle passage T past theva-ive' S into the 'hre V and thence through a passage d .to atmosphere.The

from therotation handleO as Vshown in Fig` ure 2 or upwardly as showninFigure 3. The operation of the handle will loe the same, it beingmerely necessary if this change is desired to remove the'ca'p `R andreverse the grip Q with the springe on the angularly entend/ing portionO.

l. A rock drill comprising a pressure fluid feeding element, a hollowlaterally extendingl rotation handle in communication with the feedingelement and having a vertically eX- tending portion, a. longitudinallyslidahle grip having end flanges and adapted to rotate on said portion,an internal spherical groove" 1n' said grip, a springencircling the freeend of saidy portion normally holding vsaid grip upwardly, and' a.'valve' in said portion contacting with therspherical groove andoperable 'by thejdownward motion oi" said grip "with respect toY saidportion to control the pressure fluid in said feeding 'element throughsaid hollow handle and throuoh the ortion to thev atmosphere.

l 9,.' rockt rill'comprising a pressure fluid feeding element, a hollowlaterally eX- vteiiding rotation handle in communication with thefeeding element and having a verticallyrextending portion, a'longitudinally Vslidahle grip having end flanges and adapted to` rotateon said portion, an internalspherical 'groove in said grip, a springencircling the free end of said portion 'normally holding vsaid gripupwardly, a valve reciprocahle transversely through 'the' portion'constantly contacting with the spherical groove and 'adapted 'to beopened :by said groove upon downward movement of the grip on'the portionfor releasing pressure 4fluid from the Vfeeding element throughthehollow handle andthe portion to the atmosphere, and a cap inthe yfreeend; of the portion to form a `seat for the spring and for preventingremoval of the grip from the rportion'.

y Intestin'iony 'whereof I have signed this specification.

GaovER G, TUTT'LE.

